Short answer
A chemical peel applies an acid solution that removes the outer layers of skin in a controlled way, so that new, smoother skin grows in its place. Light peels affect only the surface layer and heal in about a week; medium peels reach the upper part of the deeper layer and take one to two weeks; deep peels go further, take two to three weeks to heal and carry more serious risks. The right depth, if any, depends on the concern being treated, skin colour and how much recovery time and risk a person can accept.
Key points
- Deeper peels give bigger changes but longer recovery and higher risk.
- Light peels are usually repeated as a series; a deep peel is done only once.
- Darker skin has a higher risk of pigment changes, which can be permanent.
- Peels do not tighten sagging skin or remove deep scars and wrinkles.
- Strict sun protection is needed before and after any peel.
How peels work
Skin has an outer layer (the epidermis) and a thicker layer beneath it (the dermis). A peel solution causes a controlled injury to a chosen depth; the damaged skin then peels away and is replaced as the skin heals.1 The deeper the injury, the more the skin can change, and the longer and riskier the healing.
Depth is controlled mainly by the choice of acid and its strength. Common agents include glycolic, salicylic and lactic acids for light peels, trichloroacetic acid (TCA) for medium peels, and phenol (carbolic acid) for deep peels.3
Which depth is which
| Feature | Light (superficial) | Medium | Deep |
|---|---|---|---|
| Depth | Outer layer only | Outer layer and upper dermis | Into the lower dermis |
| Typical agent | Glycolic or salicylic acid | TCA, sometimes with glycolic acid | Phenol |
| Used for | Fine lines, some acne, uneven tone, dryness | Wrinkles, age spots, acne scarring, uneven tone | Deeper wrinkles, scars, precancerous patches |
| Healing | About 1 to 7 days | About 7 to 14 days | About 14 to 21 days |
| Repeats | Often 3 to 5 peels, every 2 to 5 weeks | Can be repeated if needed | Only once on the face |
Light peels
Light peels cause mild stinging, then sunburn-like redness and flaking for a few days, and make-up can usually be worn the next day.1 Dermatologists use them for some types of acne, age spots, dull or rough skin, fine lines, freckles and melasma (patchy brown pigmentation).4 Because each peel is gentle, results come from a series.2
Medium peels
Medium peels cause stinging and burning for up to 20 minutes, followed by redness, swelling, crusting and peeling.1 Healing takes 7 to 14 days, antiviral tablets are usually given for 10 to 14 days to prevent cold sores, and full sun avoidance is needed until healed.2 Redness can persist for months.1
Deep peels
Deep phenol peels are a different order of procedure. Phenol can cause irregular heartbeat and harm the kidneys and liver, so the heart is monitored and fluids are given through a drip, with the face treated in portions over about 90 minutes.1 The AAD describes general anaesthesia in a surgical setting, home recovery of 2 to 3 weeks and sun avoidance for 3 to 6 months.2
What peels cannot do
Peels cannot remove deep scars or deep wrinkles, or tighten sagging skin.1 Sagging, bulges, deep scars and severe wrinkles respond poorly, and other treatments, including surgery, may suit them better.3 Results may also not be permanent, since sun-damaged skin can go on producing new spots.2
Risks, and why skin colour matters
Redness, scabbing and swelling are expected after all peels. Recognised complications include infection, cold sore flare-ups and, rarely, scarring, usually on the lower face.1 Darkening of the skin is more common after light peels and lightening after deep peels; both are more common in brown or Black skin and can be permanent.1
People with darker skin can have peels, but the AAD advises that this should be with a dermatologist experienced in treating darker skin.2 Superficial peels are generally usable on all skin types, while deeper peels carry a greater risk of darkening after inflammation (post-inflammatory hyperpigmentation).3
Peels are generally avoided after isotretinoin (an acne medicine) in the previous six months, with a personal or family history of keloid scars, in pregnancy, and with frequent or severe cold sores.1 The US regulator has warned that some peels sold for home use have caused serious injuries.4
Common questions
Does a chemical peel hurt?
Light peels usually cause mild stinging, medium peels stinging and burning for up to 20 minutes, and deep peels are done under anaesthesia.12
When can I wear make-up again?
Usually straight away or the next day after a light peel, after 5 to 7 days for a medium peel and after at least 14 days for a deep peel.2
Can peels help acne scars?
Medium and deep peels are used for acne scarring, but deep scars respond poorly.3 See which treatments can improve acne scars.
How do peels compare with laser resurfacing?
Both remove damaged skin to a chosen depth, using different tools. See what laser skin resurfacing is.
Bottom line
Peel depth is a trade-off: light peels are low-risk but subtle and need repeating, while deep peels can change the skin substantially at the cost of weeks of recovery and serious risks. Skin colour and sun exposure strongly shape what is safe, and peels do not lift sagging skin.
Related reading
- Medical aesthetics overview
- What Is Laser Skin Resurfacing?
- What Are the Treatment Options for Melasma?
- Which Treatments Can Improve Acne Scars?
Sources
- Mayo Clinic. Chemical peel. Mayo Foundation for Medical Education and Research. https://www.mayoclinic.org/tests-procedures/chemical-peel/about/pac-20393473. Accessed 5 November 2026.
- American Academy of Dermatology. Chemical peels: FAQs. AAD. https://www.aad.org/public/cosmetic/younger-looking/chemical-peels-faqs. Accessed 5 November 2026.
- Cleveland Clinic. Chemical Peels: Types of Peels, Conditions Treated, What to Expect. Cleveland Clinic; 2021. https://my.clevelandclinic.org/health/treatments/11010-chemical-peels. Accessed 5 November 2026.
- American Academy of Dermatology. Chemical peels: Overview. AAD. https://www.aad.org/public/cosmetic/younger-looking/chemical-peels-overview. Accessed 5 November 2026.
Article history
- — First published.